- In Europe, getting funding is literally like pulling teeth. Just to get a measly hundred thousands of € in funding you're expected to provide a comprehensive business plan, financials, etc. that would rival M&A due diligence other places. In Silicon Valley you can get more funding by simply meeting the right angel investor, and providing a good pitch - done deal.
- In Europe, the end goal for many startups is to be acquired by some megacorp or market leader, for something like €10m-€50m. In the US you can multiply that number by 10 or 100, or in general have ambitions of developing the startup into a unicorn.
That was at least how things used to be. US has a long, long history of (risk willing) VC investments - while European countries have been lagging far behind.
Good VC cultures have developed in some European countries for the past 10-15 years, and startups have become more ambitious, but unfortunately there's still a culture of nickel and diming startups. And the places that rob you, will fund you maybe a month or two worth of capital.
EDIT: Should be said, that I'm also from Europe. And as someone else have pointed out in this thread, Europeans hate risk.